They say that everyone has a twin somewhere out there — and, of course, that includes TV characters. So, in honor of Look-Alike Day, your friends at TVLine have compiled a photo gallery of some of our fictional favorites whose doppelgängers left us seeing doubles.

Biological twins and uncanny cousins did not make the cut — so put down your Patty Dukes. What is included in our eye-popping round-up are identical or close-to-it duos from series past (Brady Bunch, Buffy, Bonanza) and present (The Flash, S.H.I.E.L.D., The Walking Dead) — and, in a couple of cases, not just perfect pairings but a whole group of look-alikes. Has your interest been twin-piqued yet?

Flip through the attached gallery (click here for direct access) and then hit the comments to denote your all-time favorite TV doppelgängers.

My favorite part of that episode is watching and realizing they shot it as if they were using greenscreen and the other tricks they normally use when one actor plays both roles. Like they’re on opposite sides of the screen and never touch, and shots from over the shoulder when it’s normally the stunt double’s shoulder.

the may vs. agent 33 story also gae us one of the best fights AoS will ever have. that was awesome.
nina dobrev did a really good job as the doubles. she’s not the strongest actor on the cast, but with the doubles, she always shone. you could tell exactly who she was playing, even if it was one of the characters pretending to be the other.

Smallville also did an alternate reality episode where Clark is raised by Lionel instead of the Kents and he is Clark Luthor….since we are also including alternate realities. It doesn’t have to be a whole slide but it could also be mentioned in what you included.

Well actually Nina has played 4 different characters Elena, Katherine, Amara and Tatia. So no Sabrina and her evil twin Katrina from Sabrina, The Teenage Witch, also the three Prues in Charmed, and Alex Russo evil version from the Wizard of Waverly Place: Alex vs Alex. Oh don’t forget Vicki and Vanessa from the Small Wonder.